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https://github.com/lifegpc/GARbro.git
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implemented FJSYS archives and MGD images.
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morkt
215
ArcFormats/NSystem/ArcFJSYS.cs
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215
ArcFormats/NSystem/ArcFJSYS.cs
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//! \file ArcFJSYS.cs
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//! \date Thu Nov 24 14:00:07 2016
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//! \brief NSystem engine resource archive.
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//
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// Copyright (C) 2016 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Security.Cryptography;
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using System.Text;
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using GameRes.Formats.Properties;
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using GameRes.Formats.Strings;
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using GameRes.Utility;
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namespace GameRes.Formats.NSystem
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{
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internal class MsdArchive : ArcFile
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{
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public readonly string Key;
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public MsdArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, string key)
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: base (arc, impl, dir)
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{
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Key = key;
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}
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}
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[Export(typeof(ArchiveFormat))]
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public class FjsysOpener : ArchiveFormat
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{
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public override string Tag { get { return "FJSYS"; } }
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public override string Description { get { return "NSystem engine resource archive"; } }
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public override uint Signature { get { return 0x59534A46; } } // 'FJSY'
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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public FjsysOpener ()
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{
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Extensions = new string[] { "" };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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if (file.View.ReadByte (4) != 'S')
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return null;
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uint names_size = file.View.ReadUInt32 (0xC);
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int count = file.View.ReadInt32 (0x10);
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if (!IsSaneCount (count))
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return null;
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uint index_offset = 0x54;
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uint index_size = (uint)count * 0x10;
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var names = file.View.ReadBytes (index_offset + index_size, names_size);
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var dir = new List<Entry> (count);
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bool has_scripts = false;
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for (int i = 0; i < count; ++i)
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{
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var name_offset = file.View.ReadInt32 (index_offset);
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var name = Binary.GetCString (names, name_offset);
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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entry.Size = file.View.ReadUInt32 (index_offset+4);
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entry.Offset = file.View.ReadInt64 (index_offset+8);
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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has_scripts = has_scripts || name.EndsWith (".msd", StringComparison.InvariantCultureIgnoreCase);
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dir.Add (entry);
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index_offset += 0x10;
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}
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if (has_scripts)
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{
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var password = QueryPassword (file.Name);
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if (!string.IsNullOrEmpty (password))
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return new MsdArchive (file, this, dir, password);
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}
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return new ArcFile (file, this, dir);
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var msarc = arc as MsdArchive;
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if (null == msarc || string.IsNullOrEmpty (msarc.Key)
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|| !entry.Name.EndsWith (".msd", StringComparison.InvariantCultureIgnoreCase)
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|| arc.File.View.AsciiEqual (entry.Offset, "MSCENARIO FILE "))
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return base.OpenEntry (arc, entry);
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var input = arc.File.CreateStream (entry.Offset, entry.Size);
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return new CryptoStream (input, new MsdTransform (msarc.Key), CryptoStreamMode.Read);
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}
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string QueryPassword (string arc_name)
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{
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var title = FormatCatalog.Instance.LookupGame (arc_name);
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if (!string.IsNullOrEmpty (title) && KnownPasswords.ContainsKey (title))
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return KnownPasswords[title];
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var options = Query<FjsysOptions> (arcStrings.FJSYSNotice);
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return options.MsdPassword;
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}
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public override ResourceOptions GetDefaultOptions ()
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{
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return new FjsysOptions { MsdPassword = Settings.Default.FJSYSPassword };
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}
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public override object GetAccessWidget ()
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{
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return new GUI.WidgetMSD();
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}
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public static Dictionary<string, string> KnownPasswords = new Dictionary<string, string>();
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public override ResourceScheme Scheme
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{
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get { return new FjsysScheme { MsdPasswords = KnownPasswords }; }
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set { KnownPasswords = ((FjsysScheme)value).MsdPasswords; }
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}
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}
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internal sealed class MsdTransform : ICryptoTransform
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{
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const int BlockSize = 0x20;
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string m_key;
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MD5 m_md5;
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StringBuilder m_hash_str;
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int m_block_num;
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public bool CanReuseTransform { get { return false; } }
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public bool CanTransformMultipleBlocks { get { return true; } }
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public int InputBlockSize { get { return BlockSize; } }
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public int OutputBlockSize { get { return BlockSize; } }
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public MsdTransform (string key)
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{
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m_key = key;
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m_md5 = MD5.Create();
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m_hash_str = new StringBuilder (BlockSize);
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m_block_num = 0;
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}
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public int TransformBlock (byte[] inputBuffer, int inputOffset, int inputCount,
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byte[] outputBuffer, int outputOffset)
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{
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int block_count = inputCount / BlockSize;
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for (int i = 0; i < block_count; ++i)
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{
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DoTransform (inputBuffer, inputOffset, BlockSize, outputBuffer, outputOffset);
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inputOffset += BlockSize;
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outputOffset += BlockSize;
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}
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return inputCount;
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}
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public byte[] TransformFinalBlock (byte[] inputBuffer, int inputOffset, int inputCount)
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{
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byte[] outputBuffer = new byte[inputCount];
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DoTransform (inputBuffer, inputOffset, inputCount, outputBuffer, 0);
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return outputBuffer;
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}
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void DoTransform (byte[] input, int src, int count, byte[] output, int dst)
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{
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string chunk_key_str = m_key + m_block_num.ToString();
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++m_block_num;
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var chunk_key = Encodings.cp932.GetBytes (chunk_key_str);
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var hash = m_md5.ComputeHash (chunk_key);
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m_hash_str.Clear();
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for (int j = 0; j < hash.Length; ++j)
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m_hash_str.AppendFormat ("{0:x2}", hash[j]);
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count = Math.Min (m_hash_str.Length, count);
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for (int k = 0; k < count; ++k)
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output[dst++] = (byte)(input[src++] ^ m_hash_str[k]);
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}
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bool _disposed = false;
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public void Dispose ()
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{
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if (!_disposed)
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{
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m_md5.Dispose();
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_disposed = true;
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}
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GC.SuppressFinalize (this);
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}
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}
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[Serializable]
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public class FjsysScheme : ResourceScheme
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{
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public Dictionary<string, string> MsdPasswords;
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}
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public class FjsysOptions : ResourceOptions
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{
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public string MsdPassword;
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}
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}
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